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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51ce3b1e0e96226ac1a6d4baca4847c039d30ee2fca1a0ef53d8c42e23882ef5' 
  AND token = 'oY+rjR/ERDirt0e1ygOC2gc7rUK8o3vJnoywvz5hXxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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