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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb20d4ff2f4b0499050997ab73d5d915d33f8f07aa7aa4583c4f24ef3a0210fd' 
  AND token = 'BOq2EXMJQ+b94PUmnFB5HEINv2gkgQxeOlPV2YGvBfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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