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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f93761018491fad673a082dceb066272d4402e51c35250aa27d63835fbce747f' 
  AND token = 'Ol9TVec3KJ9XJuipnJx0DDklWluassFHZXJRf1SaH2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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