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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0646004adecb5333e7f5cf118ed81ce87cafff86fcea441076715e92cb14773e' 
  AND token = 'dxp+CFgF++oDjj39nz/Ap/gKl9GclscIT4vIAM4jhuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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