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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba602368a5913113576df3edfc398eb436ac29124d94fd44122738b1602355ba' 
  AND token = 'nnGMiR0fYcw7G9qh7vbuzTFvlM+XXcld2l2X2waJI5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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