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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8b9791d3618b185dd7ddc80c2643f4f7efe927a559c496b3a9a495a2e75a161' 
  AND token = 'NEVmu78QTdWnmX9O058PsaJHTZAg7qTqTbXgtCPqgIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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