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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b01aa2e3b028727d1f53a658af797b957b13dd8e09229d0b23ec0ba8ec011f0' 
  AND token = '5O9EU9kTM6EKRn/5PYWTEBRDOwvh20u/blj4FBBa/2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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