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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a98b6a4742747c9b3fbc09f5428f483422e46c9419fd9bb3b0174a09dd8511c' 
  AND token = 'i87GlWYPjRcP60j36sx//QdVQU0GsOmZZIe2un3L5yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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