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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f43747628afdbfdb98637cbc0a5640a1adf926d7c30e26949dabc8bc9e62f43' 
  AND token = 'uqONF3JAVMoutaL5qK18aUg4yUx/nmAgqEcXszRWuj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00126

JSON explain

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