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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc8818e33e3f999fcdd6621e63f2148ae89530b86c1ab62a7b328164e7917d1' 
  AND token = 'OVsluKw7VdPkVY8Y4grBN7HkcWTskH2leX7acq1Dkrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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