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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9174c927e0fd17f6537b7e11e4943f4fb0d920cd34b22db32c86a407c6f2b36' 
  AND token = 'laYQf2rttwSWWqYUllr5W4rbfSq5y4tX7NvRFTr1KIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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