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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9ba28456a658ae52de095e68fadea90beff9638187975657d8a7cb13e31ca28' 
  AND token = 'h9W8OIQ1LszXPi1U3nvH/s2yt8nqpbu94dPUskZTSS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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