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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0860294c7eff8cd64cc8a3483271f0275142a5c213e82307455ff839ef6c3055' 
  AND token = 'cBDv9GTU41T3M++JwbF9XUD3owOd8nL766s9PVNgDoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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