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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b20c32bc96f6e3fbdf7661a7c1336a475226232f0694c4e18354a29a00379c6b' 
  AND token = '9mT8nTMEASEqMThQlSnVMOTJY48iNTnYtdmbEx6ZMmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00103

JSON explain

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