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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d123ba744cac84bebe6c4ee3770126d41e82561a63727719af19cdbdf85f82c' 
  AND token = 'M2sg5LczL4WfIuPpRyZ3y2Df5z/MDlcmxhQNx24sfK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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