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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '763e00d6814b340472bff24a405928fc0f6ad8416cc26ee5f98b3e534cca2fd6' 
  AND token = 'l0lWv0fWe/cqznYSVVgFu7bZ9gWDDCUrPtXffqCmkhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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