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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87b8f66d5114e9be1f70afd8d4cf6ffb8f74ab90b18fa7bc49a809dd4eddd4b1' 
  AND token = 'ltcdnADMDfPTN7196yiRK/6QZuKajAOSU2eJtI161Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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