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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4f7eecdc74bd20084f55075c0ad1e1329e82c6553f3d63403622538bc5451f7' 
  AND token = 'ylK2kAtUw9Atxj9yJOB4vLLSe0JQOTtY2Lm4Qk5nXOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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