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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21c99047601bba8c5007b7deefb879e1c8c1337b0d3ce9ec6247adc25e431fe2' 
  AND token = 'VY1HqIEQ1kXWDGUnXmSVb0QjoeBM96TBokRZqqimSyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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