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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dabd2969363c6c49f4332d8c0039a986d65dfbf3f0a02af424f3742fc2f5da1b' 
  AND token = 'a8zbkJXnWr0b7vOr4XmrW0Kon2zonX7inTJDZGYSanE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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