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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d8007e542980bea0f6294d00281fad196f182ac002303b2c3f39890e5406287' 
  AND token = 'qUXTmpul58ylNUqMdCW5HlsIU5skMM68dcvPo9LfXHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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