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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa593e78db4f1515ace39482a5e0a0609ef98ffc7e774d4957a6bc2a9c9906fe' 
  AND token = 'l7KZCC3pbKX+OnOpnTobtqy3FY3wQakDXbL5x/UDalw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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