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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c5e8568e013401e4bed22dbf0e644cbbc1dad9dd9dde314b7d8a0b07f7ad4a2' 
  AND token = 'qSopNtfcfO2HcF2Zdhtvy+X0qCc8tTXu+VJ0kyqBYS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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