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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a04c8623b1f910fafeac7c62a5c23f6a649eb08a02613f19d1a67b83a7cc5ed' 
  AND token = 'f6DNMQcACx6kXibAB5pBFN3r05LpXiA7DY9GOVfYOPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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