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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '475502bfaadfb7c9a719203484d2f2aec9b61d2c1621a2ed9322c0027e92e0dd' 
  AND token = 'Bt5nq3R+KihilCtZtF00DM8prMbkZFaHoFS7F4h6C0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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