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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a38b4dc78d6cfb340733fc9a1e998f93ad3f79a9fe27a97c2ff2027ec743e38' 
  AND token = '4Yr8fAnOG0xqCPp3IPu1RBHcNdMm5Nx/rpFxuGudCUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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