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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2766cbf01f03e5b4d67f5ae81d5282fa41730502d8bc51b82e4b2933b33702b7' 
  AND token = '+dHxYg520CX2ycBRpgdkeXwXGl1cPPIxNRgI740+KPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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