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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f836ba12c704de5ffa960a010acd1e55743f21080b7031a429fd103134a8f8' 
  AND token = '8OQ+Wob60F2mLRH5x+aq4zKSRhfNKIAtI8J2sCJLokc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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