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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b0c9084ef3489c27e7d943fee818809a777c5df1845910e9441c80f58591c21' 
  AND token = 'LrVkdQ+NYQIqm3HtcV3Fm3bAwe6owJBit0lptlDgqnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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