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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f3aaa35d62cd9f4eda626a40bf53798233253891d4f00e1934dd9b84d7f351b' 
  AND token = 'fqorHlrRKGNR4ZO7aa/WWllyutLR0j5t23fXMtuiLto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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