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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2507e8b167bc93d32a663e30e2d268040f3c325a02a1d3213deb3ccfd386d805' 
  AND token = 'fyGryVIyHlwD1rbPtVqzr6aJi2uAKHLZ/knEuEKFJ4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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