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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6d6b38c9813a6c477e372e32cf0346060db457c6a83697bebd3767714939a9a' 
  AND token = 'AvOOcywLNlE+9/s1G4YBEtX3chft66/4VHA/0sdSlmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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