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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90feb69c0e2ea47a5c189b044dfa8032cdfcb9c72f003609a0280e9e345be4ef' 
  AND token = 'L9fxHzuRpx5qNxP9PCFsreVwPC/gt72pNFp31RDY4bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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