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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f53ba1f31e541b5f88adaced677b28da146f542d46c1badb406a256d87492a31' 
  AND token = 'LDrMhplMRWtmiNraKauDr/M0E9OPgo5cL0LhyZqHEE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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