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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038165b86efce054162416c1200148daaba487506d6ea94cfa346388b0666b25' 
  AND token = 'zRbd/J+Otx0/Id1DdsIcAt+WV+PvNPhDt+eHRIBM1YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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