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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4efc7387475e6ccf2c3495931390f241cd19ca5c31ce74af4de2d4917a0df1d' 
  AND token = '8SrsQVvU2yIokMwy46F/h1NoWx33CUgEiNH6O8Z1DY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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