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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b46325cca7c8c3b33dece54fbc236c8205974df8bc4294278abe2379d1b6f6b6' 
  AND token = '38Y7mI2R0ram601RV2VMsQiHT9h98Jnm/syxL8RwEPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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