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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b357c1010f42632da09af823db64194e492c7b62399354f105cde3469e5a7a0d' 
  AND token = '/XhnPScYNI2YcvADJ956o5NZ8dK5RlQ8GJ15vKEOrPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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