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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb5a20a29e21a1f84828c05f12895014871b5436f90a9711192fae8690582b28' 
  AND token = 'AsJElHoEh/dGaG53VMjiJ4gMx8LVtwO9DMmXa11uUxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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