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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '518784af87e79c2862fb09d0f58d9215aac7288f3df8cff18f011bdbbba1a0b4' 
  AND token = 'RnOJm9rmfPhZ2n5H5XTdrdB+gy8pS5Fkj/bs48LMYpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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