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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cbcb8ca78149180cba6001e4da935f8d5d898da04bc42bed05c109f1d3bd035' 
  AND token = '/UhOD0xI3c/QzdSrugbpSGbzpKzuabQhF9n0dKdMGpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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