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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d06fa6acd8e334df653d7a0c185aa4dcdffc836f65337ce14d986f10c7359f' 
  AND token = 'QFJ9nXm7AoR6+laaJz9R7aREi0P+8it34ryJlgQH2ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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