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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eda491e22cf99a6cc8a9e44e8f8388fcae73828ce4444b088e2993d62023a403' 
  AND token = 'wzJUV+0psGlwiFL4p/vLT7Y79ganrfp2WS87L7/JBB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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