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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b5d66838ab81ba5700c8daa884ee3408f048667a0e58d9c76de33af57071a62' 
  AND token = 'VdKr0q2iDiCMI/FBjtq0qOyvtqWoYAAD5a1GKRHDNDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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