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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '054bad6a2a5af4d052fa8c77925a35e69b88cb7c6557caa31739064b7761a184' 
  AND token = 'X/I8E7XuNt7NBE7RGoJbBHAcC3n5Hko25WvN97bMBic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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