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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d32e2da8a8640a6cf9851baa4d0c273de23e23edc38c148c5a0a59ec58a47a1' 
  AND token = 'jdbz0m9R/SvwkPgo/EJzqQDLC+ayIrGLJxuTS5oYJyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}